11KV RESIN Cast Current Transformers

MODEL NO: AV-CT-11KV-01
MODEL NO: AV-CT-11KV-01
MODEL NO: AV-CT-11KV-04
MODEL NO: AV-CT-11KV-04

11KV RESIN Cast Current TRANSFORMERS

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  • Current instrument transformers CT’s are designed for the measurement and protection of the distributing facilities of high voltage for inner settings.
  • The value of the secondary current is 5 A or 1 A with the possibility of combination. The classes of accuracy for the circuits of measurement are 0.2S, 0.2, 0.5S, 0.5, 1, 3, for the circuit of protection are 5P, 10P and PS. The transformers comply with the required class of accuracy within the values from 25% to 100% of rated load.
  • The limiting working current is 120% of IN, according to the agreement of producer and customer it is possible to supply other values, for example 200% of IN.
  • CT’s are constructed as transformers with single-turn or multi-turn primary winding. The up-to-date construction of these transformers allows the switching not only on the secondary side but also on the primary one. The primary switching can be easily mounted by the means of connection of two jumpers to the circuit by the means of two screws M12.
  • The secondary winding is wound on a magnetic core made from grain oriented sheets, or alloys of nickel, iron and copper (permalloy). The number of cores can be from 1 to 3 according to the request of customer and according to the required parameters.
  • All active parts of transformer are compound-insulated with epoxy-mixture. This material performs both the electrical insulating and the mechanical functions.
  • The mounting position of transformers is arbitrary. Transformers are fixed by the means of four screws in the holes in the base plate. The primary terminals of transformers are equipped with screws M12.
  • We recommend use terminal ends corresponding to the used cross-section of the conductor for attaching to the secondary outlets. The secondary terminal plate is equipped with the cover with sealing screw. Inside, there is the set with jumpers and small screws for the possibility of earth connection and short circuiting of the wiring.
  • Transformers CTS 12 S complied with all the tests according to IS-2705(1992)
  • IEC 61869-1, IEC 61869-2, IEC 61243-5, IEC 60068-2-11, GOST 7746-2001, GOST 1516.3-96.For the customer’s request we provide official calibration.
  • It is possible to consult other technical parameters with the producer.

Technical Specifications

Highest voltage for equipment 12/17.5 kV
Power frequency test voltage
28/38 kV
Lightning impulse test voltage
75/95 kV
Nominal primary current
5 – 3200 A
Nominal secondary current
5 A or 1 A
Rated short-time thermal current, Ith
max 80 kA/1s (31,5 kA/3s)
Rated dynamic current, Idyn
max 200 kA
Rated continuous thermal current, Icth
120% In
Accuracy class – measurement
0.2S, 0.2, 0.5S, 0.5, 1, 3
Accuracy class – protection
5P, 10P, PS
Nominal power
2,5 – 30 VA
Nominal frequency
50 Hz
Thermal insulation classt
E
Operation conditions
Operating temperature from -5 to + 40 °C Corresponds to temperature class -5/40 according to IEC 61869-1
Standard
IS-2705 (1992) IEC 61869-1, IEC 61869-2, IEC 61243-5, IEC 60068-2-11